I think we will only see more manipulation if this happens , if the banks will profit of bitcoin going up are down then they are gonna make sure that is what happens. Like someone said above , this defeats one of the reasons why bitcoin was invented in the first place. So maybe they will offer it in the future but my hope is as a community we stay away from it.
Bitcoin should not be accepted on banks because its not a store of assest. Also, its very unlikey that banks would accept large amount of Bitcoin because its very suspicious specially when auditin of their central banks.